Degradation detection system, brake control device, and degradation detection method

A degradation detection system for a pressure regulating valve in a pressure control device that includes (i) a conversion valve to adjust a pressure of a fluid supplied from a fluid source based on an electrical command and output the fluid, and (ii) the pressure regulating valve to adjust, in accordance with a pressure of the fluid output by the conversion valve, the pressure of the fluid supplied from the fluid source and output the fluid, the degradation detection system comprising:

• a simulator to (i) acquire a command pressure that is the pressure of the fluid output by the conversion valve, (ii) apply the command pressure to a physical model that expresses physical quantities of components of the pressure regulating valve based on a parameter of each of the components of the pressure regulating valve, and (iii) calculate a response pressure that is the pressure of the fluid output by the pressure regulating valve, thereby obtaining a waveform of the calculated response pressure corresponding to a waveform of the command pressure in a case in which the command pressure is changed;
• a waveform identifier to
• acquire a detected response pressure that is a detected value of the response pressure corresponding to the command pressure, and
• identify (i) a waveform of the calculated response pressure that matches a waveform of the detected response pressure and (ii) the parameter of the physical model used for obtaining the waveform of the response pressure;
• and
• a degradation identifier to identify a degraded component among the components of the pressure regulating valve from a value of the parameter, identified by the waveform identifier, of the physical model used for obtaining the waveform.